net: Add skb_free_frag to replace use of put_page in freeing skb->head
This change adds a function called skb_free_frag which is meant to
compliment the function netdev_alloc_frag. The general idea is to enable a
more lightweight version of page freeing since we don't actually need all
the overhead of a put_page, and we don't quite fit the model of __free_pages.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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